How do all $Platyhelminthes$ differ from $Aschelminthes$?

Differentiate between Phylum Platyhelminthes and Phylum Aschelminthes.

Which one of the following groups of three animals each is correctly matched with their one characteristic morphological feature?

Which one of the following animals is correctly matched with its one characteristic and the taxon?
Animal - Characteristic - Taxon

Which of the following groups contains one or more animals that are not pseudocoelomate?

Given below are two statements:
Statement $I$: When any plane passing through the central axis of the body divides the organism into two identical halves, it is called radial symmetry.
Statement $II$: In phylum Echinodermata, both adults and larvae are radially symmetrical.
In the light of the above statements, choose the most appropriate answer from the options given below: